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avcodec/qpeg: Limit copy in qpeg_decode_intra() to the available bytes

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Fixes: Timeout (27 sec -> 39 milli sec)
Fixes: 13151/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QPEG_fuzzer-5717536023248896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b819472995f55e827d6bb70dcdd86d963f65ae31)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-02-24 00:44:40 +01:00
parent 6c0124d392
commit c90836cc3d
1 changed files with 2 additions and 0 deletions
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2
libavcodec/qpeg.c
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@ -90,6 +90,8 @@ static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
}
}
} else {
if (bytestream2_get_bytes_left(&qctx->buffer) < copy)
copy = bytestream2_get_bytes_left(&qctx->buffer);
for(i = 0; i < copy; i++) {
dst[filled++] = bytestream2_get_byte(&qctx->buffer);
if (filled >= width) {